Work holding clamp and drill jig



April 10,1934, H. w. MASS WORK HOLDING CLAMP AND DRILL JIG Filed Jan. 18, 1933 2 Sheets-Sheet 1 April 10, 1934. H. w. MAss WORK HOLDING CLAMP AND DRILL JIG Filed Jan. 18, 1953 -2 Sheets-het 2 z m m M 35 m M W m w H I Patented Apr. 10, 1934 UNITED STATES PATENT OFFICE 1,954,708 WORK HOLDING CLAMP AND DRILL JIG Henry W. Mass, Rochester, N. Y.

Application January 18, 1933, Serial No. 652,386 7 Claims. (01. 77-432) The invention relates to a work holding clamp chine (not shown). Said base has an upper work and drill jig. I supporting surface or upper portion that is not The object of the present invention is to imobstructed by any integral portion or part of prove the construction of work holding clamps the base. The screw 6 passes through the clampand drill jigs and to provide a simple, practical ing plate and is provided above the same with a and compartively inexpensive construction nut 10 for enabling the plate 5 to be adjusted equipped with means for squaring up work and ,vertically, a washer being preferably interposed securely clamping the same in position for drillbetween the plate 5 and the nut 10 as shown. ing, reaming or other machine or hand opera- The plate 5 extends into the slot 4 and engages ime. the bottom wall thereof for holding the base A further object of the invention is to provide firmly upon the bed 9 in an adjusted position a work holding clamp and drill jig capable of and the plate 5 is maintained in firm clamping being readily arranged for accurately drilling and engagement with the base by means of a clamp reaming holes in work at any point within the screw 11 threaded through the outer end por- 15 capacity of the lay-out plate; tion of the plate 5 and having a reduced terminal With these and other objects in view, the inportion 12 which engages the bed 9 at one side vention consists in the construction and novel of the adjacent groove 8. The clamp screw 11 combination and arragement of parts hereinis provided at its upper end with a knurled head, after fully described, illustrated in the accombut any other suitable means may of course ,be 20 panying drawings and pointed out in the claims employed for enabling the clamp screw to be hereto appended, it being understood that various adjusted. changes. in the form, proportion and minor de- The rectangular base is provided in the upper tails of construction, 'within. the scope of the face of the lay-out plate 2 adjacent two of the claims, may be resorted to without departing marginal edges thereof with longitudinal recesses from the spirit or sacrificing any of the ad- 3 p v ding grooved P t ons o ming seats arvantages of the invention. ranged at right angles to each other and receiv- Figure 1 is a plan view of a work holding clamp in he l w r edges of fixed work abutment and and drill constructed in accordance with this inquaring bars 14 detachably secured to the base ii by screws 15 and 16 arranged in countersunk or Fig. 2 is a side elevation of the same. counterbored open ngs 17 and 18 so that the heads Fig. 3 is a vertical sectional view taken on the of the ws 15 an h pp r nds of the screws line 3 of 1 16 will lie below the upper faces of the fixed bars Fig. 4 is a detail horizontal sectional view on 14, h ja nt ends of the fixed bars 14 are the line 4-4 of Fig. 2.. arranged contiguous to each other, as clearly Fig. 5 is a perspective view of the work holding us a in FigS- 1 and 5 0f the drawings, d clamp, the master drillirfg disk and the adjustey se t nn p p ular aces 19 a ainst able clamping means for holding the same being Wh h the W to be clamped n p r o v d, I abuts. It will also be noted that the lower por- Fig. 6 isa vertical sectional view on the line 111011 of h q a bar 14 has a neat fit in the 40 Fig 5 grooved portion to which it corresponds, or in In the accompanying drawings in which is other words in which it is placed, whereby the illustrated the preferred embodiment of the in ed p tion affords a p oper p tio of vention the work holding clamp and drill jig comthe abutment 1 Squaring ar When it is secured prises in its construction a base 1 preferably conin Place y the holding ws 5 and 16. It will 5 structed of cast iron but any other suitable mate also be noted that when the Squaring ars 14 are rial may of course be employed. The said base, e ved t p upp ur ace is unobwhich is rectangular and hollow is composed of u t d,. y e made completely bstructa horizontal top lay-out plate 2.and vertical sides ed, with a consequent construction that permits 3 provided with longitudinal. slots 4 adapted to a member which is so long th i x nd p form hand'holds for. enabling the device to be opposite marginal edges to be clamped to, to be readily handled and carried and also to receive supported by and to be operated upon while thus clamping plates 5 of adjustable clamps composed n t e cl p 0 base p of inverted screws 6 provided at their lower ends The lay-out plate is provided with equally with heads 7 and .slidably mounted in undercut spaced broached square holes 20 which are pref- 55 grooves 8 of the bed 9 of a drilling or other maerably countersunk or flared at the upper face of the lay-out plate. The broached holes are adapted to receive square posts 21 of adjustable work engaging clamps and a square shank or post 22 of an adjustable clamp for holding a master drilling disk 23. In Figs. 1 to 3 of the drawings a piece of work in the form of a rectangular plate 24 is clamped against the work abutment and squaring bars 14 and the master drilling disk is also clamped in position for guiding the drill oi a drilling machine (not shown).

The post 21 is provided adjacent its upper end with an inclined threaded opening 25 in which is arranged an inclined work clamping screw 26 having a reduced engaging end 2'? and adapted to engage the work at the edge thereof for firmly clamping the same against the fixed abutment and squaring bars and also for exerting a downward pressure on the work for holding the some down upon the lay-out plate; In Figs; 5. to 3, inclusive, of the drawings two adjustable clamps arranged at right angles to each other engage two, of the edges of the rectangular plate as for holding the same against the fixed bars 14 for squaring the worlr and for holding the same. In Fig. 5 of the drawings the work 28, which consists or an oblong block and which is supported in an eievatedposition slightly above the layout plate by a plate 29, is clamped against the fixed bars 14. by three of the adjustable clamps, two being located at one side of the block and one of the clamps being located at one end of the block.

The plate 29 which is separate from the base and removable therefrom is simply employed for supporting the block 28 in the desired position for drilling. The screw 26 preferably has a knurled head 30 and is provided with a polygonal shaped longitudinal socket 31 extending inwardfly from the end face of the head 30 and. adapted to receive a wrench or tool for enabling the screw 28 to be tightened to the desired degree. The head so of ,the screw 26 is also preferably provided with a transverse opening 32 for the reception of a pin or other tool when it is more con venient for applying force to the screw 26 for operating the same.

The fixed bars 14: provide a solid abutment for the master drilling disk 23 which is provided with a tapered opening for the reception of a tapered tool steel bushing 33 which provides an opening for guiding a drill in the usual manner whereby holes may be accurately drilled in the plate 24 or other work. Suitable blocks 34 are interposed between the fixed bars 14 and the master drilling disk and are arranged at right ongles as clearly illustrated in Fig. 1 of the drawings. Blocks of various sizes may of course be employed for'positioning the master drilling disk for drilling a hole at any desired point within the capacity of the lay-out plate. The master drilling disk is clamped firmly in operative position by a reversible and adjustable clamping jaw 35 of approximately oblong form and preferably constructed of tool steel. The clamping body 35 is provided at its inner disk engaging end with spaced engaging portions 36 having arcuate end faces 37 for fitting against and engaging the side .face or edge of the master drilling disk.

is positively held down and securely maintained in a horizontal position upon the work and in engagement with the master drilling disk. The oppositely inclined .outer end faces 39 render the clamping jaw reversible so that either of its horizontal faces may be arranged uppermost and one of the inclined faces will always be in position to be engaged by the inclined clamping screw 40.

The inclined clamping screw 40 is mounted in an inclined threaded opening 41 in a swiveled head 4.2 carried by the shank or post 22. The shank or post 22 is provided in its upper portions with a vertical socket 43 forming an upper tubular portion for the shank or post 22 and receiving a vertical stem 44 formed integral with and extending downwardly from the head 42. The stem 44 is provided with an annular groove 45 which is engaged by a transverse pin 46. The pin 46 pierces the upper tubular portion of the shank or post 22 and retains the stem or spin die portion 44.- 01 the head 42 whereby the head &2 is swiveled to the shank or post 22.

The engaging end d7 of the inclined screw 40 is reduced for engaging the clamping jaw 35.

Various kinds of work may be squared up and in Figs. 1 and 2 or the drawings, the work holding clamps only may be used, as illustrated in Figs. 5 and 6 of the drawings. The sides of the hollow base are of sufiicient height to provide ample space within the hollow base into which the lower portions of the posts 21 and 22 may project. The flared 'or reamed upper ends of the broached holes in the horizontal lay-out plate of the hollow base facilitate the ready introduction of the posts 21 and 22 into the spaced holes 20.

-The inner vertical faces 19 of the fixed work abutment and squaring bars 14 are arranged in parallelism with the adjacent side walls of the square openings in the lay-out plate so that the square posts of the adjustable clamps when placed in any of the holes will maintain the clamping screws directly opposite one or the other of the said bars 14 so as to positively clamp the work against accidental slipping.

What is claimed is:

l. A work holding clamp including a hollow rectangular base composed of a horizontal lay-out plate having an unobstructed flat work supporting surface and provided with spaced square openings and with recesses arranged at right angles to each other and which extend along two adjacent side portions of the lay-out plate at the marginal edges thereof, said base having vertical supporting sides that provide portions with longitudinal slots therein which in turn provide hand holds and which are also adapted to receive clamping-members for securing the base to a bed of a machine, said work holding clamp also having fixed work abutments or squaring bars arranged at right angles to each other and rigidly but detachably secured in and positioned by the recessed portions of the lay-out plate, and a set of adjustable clamps each of which comprises a square post that fits the square opening of the lay-out plate and a clamping screw that is sup-- ported by the post, at least one of said adjustable clamps being constructed so that it comprises 1 clamping body provided with an inner disk-engaging end, a post fitted in an opening of the base and constructed so as to have a tubular upper portion, a head having a depending integral spindle mounted in the tubular portion of the post, which spindleis provided with an annular groove, a fastening device carried by the post and engaging the grooved portion of the spindle whereby the head is swiveled to but held in position on the post and a clamping screw supportedby said head and engaging the outer end of the body.

2. In a work holding clampas defined in and by the claim preceding, a clamping body provided at its inner end with spaced faces whereby the clamping body can properly engage work pieces of different diameters and having oppositely inclined faces at its outer end, either of which is adapted to be engaged by the clamping screw corresponding thereto.

3. A work holding clamp including a hollow rectangular base composed of a top horizontal lay-out plate that provides an unobstructed upper supporting surface and of vertical sides that extend downwardly from said top plate, said vertical sides having hand openings whereby to move the device and also providing spaces to receive clamping devices whereby to secure the devices fixedly on a support, the top plate being provided with a plurality of openings, fixed work abutments or squaring bars arranged at right angles to each other and rigidly but detachably secured to the base in grooved portions of the base adjacent two of the marginal edges of the lay-out plate and within which grooved portions the lower portionsof the squaring bars fit, and a plurality of adjustable clamps composed of clamping screws and posts supporting the clamping screws and fitting the openings in the lay-out plate whereby the adjustable clamps may be arranged in different positions on the lay-out plate.

4. A work holding clamp including a hollow rectangular base composed of a top horizontal lay-out plate that provides an unobstructed upper supporting surface and of vertical sides that extend downwardly from said top plate, said vertical sides having hand openings whereby to move the device and also providing spaces to receive clamping devices whereby to secure the device fixedly on a support, the top plate being provided with a plurality of openings, fixed work abutments or squaring bars arranged at right angles to each other and-rigidly but detachably secured to the base in grooved portions of the base adjacent two of the marginal edges of the lay-out plate and within which grooved portions the lower portions of the squaring bars fit, and a plurality of adjustable clamps composed of clamping screws and posts supporting the clamping screws and fitting the openings in the lay-out plate whereby the adjustable clamps may be arranged in different positions on the lay-out plate, said posts being slidable in any one of said openings and said clamping screws being arranged upon a downward inclination with relation to said posts and the lay-out plate whereby when said clamping screws are engaged tightly with the work the of the lay-out plate and presenting inner vertical abutment faces arranged at right angles to each other, said plate having a plurality of vertical openings extending therethrough and which openings are rectangular in cross section, and adjustable clamps each of which comprises a post which is rectangular in cross section and 'slidable in any one of said openings and a clamping screw operating through a threaded opening in the upper end of the respective post, each of said first mentioned openings being flared at its upper end to facilitate insertion of the respective posts in such openings and the sides of said rectangular openings being disposed in parallelism with one or the other of said right angularly disposed squaring bars so that the posts of said adjustable clamps when placed in said openings will maintain the clamping screws parallel with one or the other of the said bars so as to positively clamp the work against accidental slipping, said depending sides of said hollow base having openings therein to provide hand-holds for readily removing the device from one place to another or to receive elements of suitable clamping means for holding the device against movement on a support.

6. A work holding device including a hollow, rectangular shaped base which is composed of a top horizontal lay-out plate and depending vertical sides which support the lay-out plate in elevated position, fixed work squaring bars arranged at right angles to each other and extending along adjacent sides of the lay-out plate and presenting inner vertical abutment faces arranged at right angles to each other, said plate having a plurality of vertical openings extending therethrough and which openings are rectangular in cross section and adjustable clamps each of which comprises a post which is rectangular in cross section, and a clamping screw operating through a threaded opening in the upper end of the respective posts, the sides of said rectangular openings being disposed in parallelism with one or the other of said right angularly disposed squaring bars so that the posts of said adjustable clamps when placed in said openings will maintain the clamping screws parallel with one or the-other of said bars so as to positively clamp the work against accidental slipping, said posts being slidable in any one of said openings interchangeably and said clamping screws being arranged upon an incline with relation to said posts and said lay-out plate whereby when said clamping screws are engaged tightly with the work the posts will bind against opposite side walls of said vertical openings at the ends of the latter and the posts thereby held positively against vertical movement by reason of the downward thrust of the screws and the work maintained against upward or other displacement.

7. A work holding device including a hollow, rectangular shaped base which is composed of a top horizontal lay-out plate and depending vertical sides which support the lay-out plate in elevated position, fixed work squaring bars arranged at right angles to each other and extending along adjacent sides of the lay-out plate and presenting inner vertical abutment faces arranged at right angles to each other, said plate having a plurality of vertical openings extending therethrough and which openings are rectangular in cross section and adjustable clamps each the respective posts, the sides of said rectangular openings oeing disposed in parallelism with one or the other of said right angularly disposed squaring bars so that the posts of said adjustable clamps when placed in said openings will maintain the clamping screws parallel with one or the other of said bars so as to positively clamp the work against accidental slipping, said posts being slidable in any one of said openings interchangeably and said clamping screws being arranged upon an incline with relation to said posts and said lay-out plate whereby when said clamping screws are engaged tightly with the work the posts will bind against opposite side walls of said HENRY w. MAss'. 

